U.S. patent application number 15/811238 was filed with the patent office on 2018-03-22 for light sources system and projection device using the same.
This patent application is currently assigned to Appotronics Corporation Limited. The applicant listed for this patent is Appotronics Corporation Limited. Invention is credited to Liangliang Cao, Fei Hu, Yi Li.
Application Number | 20180080626 15/811238 |
Document ID | / |
Family ID | 48135823 |
Filed Date | 2018-03-22 |
United States Patent
Application |
20180080626 |
Kind Code |
A1 |
Hu; Fei ; et al. |
March 22, 2018 |
LIGHT SOURCES SYSTEM AND PROJECTION DEVICE USING THE SAME
Abstract
A light source system and projection device. The light source
system includes an excitation light source, a first light
collection device, a light collection device, and a wavelength
conversion device. The excitation light source generates an
excitation light; the excitation light is incident on the light
collection device and is directed by the light collection device to
be input to the wavelength conversion device. The wavelength
conversion device converts the excitation light to a converted
light. At least a part of the converted light is output from an
input side of the wavelength conversion device on which the
excitation light is input. A majority of the converted light output
from the input side of the wavelength conversion device is
collected by the light collection device and directed to the first
light collection device, and then collected by the first light
collection device.
Inventors: |
Hu; Fei; (Shenzhen, CN)
; Li; Yi; (Pleasanton, CA) ; Cao; Liangliang;
(Shenzhen, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Appotronics Corporation Limited |
Shenzhen |
|
CN |
|
|
Assignee: |
Appotronics Corporation
Limited
Shenzhen
CN
|
Family ID: |
48135823 |
Appl. No.: |
15/811238 |
Filed: |
November 13, 2017 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
13655869 |
Oct 19, 2012 |
9816683 |
|
|
15811238 |
|
|
|
|
61549367 |
Oct 20, 2011 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F21K 9/64 20160801; G03B
21/204 20130101; F21V 9/32 20180201; F21V 13/14 20130101; F21V 7/22
20130101; F21Y 2115/10 20160801; F21V 9/45 20180201; G03B 21/2066
20130101; F21Y 2115/30 20160801 |
International
Class: |
F21V 7/22 20060101
F21V007/22; G03B 21/20 20060101 G03B021/20 |
Claims
1. A light source system, comprising: an excitation light source; a
first light collection device; a light collection device; and a
wavelength conversion device; wherein the excitation light source
generates an excitation light; wherein the excitation light is
incident on the light collection device and is directed by the
light collection device to be input to the wavelength conversion
device; wherein the wavelength conversion device converts the
excitation light to a converted light, wherein at least a part of
the converted light is output from an input side of the wavelength
conversion device on which the excitation light is input; and
wherein a majority of the converted light output from the input
side of the wavelength conversion device is collected by the light
collection device and directed to the first light collection
device, and then collected by the first light collection
device.
2. The light source system of claim 1, further comprising first
light introducing device, disposed on the first light collection
device; wherein the excitation light is directed by the first light
introducing device to the light collection device.
3. The light source system of claim 2, wherein the first light
collection device is a reflection device, and the first light
introducing device is a light transmission area on the reflection
device; wherein a majority of the converted light output from the
input side of the wavelength conversion device is collected by the
light collection device and directed to the reflection device, and
the reflection device reflects the converted light.
4. The light source system of claim 3, wherein the reflection
device is a flat reflection device.
5. The light source system of claim 2, wherein a luminous flux of
the converted light that is incident on the first light introducing
device is less than or equal to a quarter of a luminous flux of the
converted light incident on the first light collection device.
6. The light source system of claim 2, wherein an area of the first
light introducing device is less than or equal to a quarter of an
area of the first light collection device.
7. The light source system of claim 1, further comprising a light
reflection substrate; wherein a part of the converted light
generated by the wavelength conversion device is output form
another side of the wavelength conversion device which is opposite
to the input side on which the excitation light is input; and
wherein the converted light output from the other side of the
wavelength conversion device is reflected by the light reflection
substrate back to the wavelength conversion device, and is
transmitted through the wavelength conversion device and then
output from the input side of the wavelength conversion device.
8. The light source system of claim 1, wherein the wavelength
conversion device includes a transparent substrate and wavelength
conversion materials doped in an interior of the transparent
substrate.
9. The light source system of claim 7, wherein the wavelength
conversion device includes a wavelength conversion material layer
coated on the light reflection substrate.
10. The light source system of claim 8, further comprising
scattering particles or scattering structures disposed in the
interior or on a surface of the transparent substrate.
11. The light source system of claim 9, further comprising
scattering particles or scattering structures disposed in an
interior of the wavelength conversion material layer.
12. The light source system of claim 1, wherein the light
collection device is a lens or lens group.
13. A projection device comprising the light source system of claim
1.
Description
[0001] This application is a continuation of U.S. application Ser.
No. 13/655,869, filed Oct. 19, 2012, which claims priority under 35
USC .sctn. 119(e) from U.S. Provisional Patent Application No.
61/549,367, filed Oct. 20, 2011. The above referenced applications
are herein incorporated by reference in their entireties.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] This invention relates to the field of optical technology,
and in particular, it relates to light source systems and
projection devices using the light sources.
Description of the Related Art
[0003] Currently, high brightness color light sources are needed in
a wide variety of applications, including stage lighting,
projection display and RGB (red, green and blue) backlight, etc.
Traditionally, gas discharge lamp (for example, super high pressure
mercury lamp) as a high brightness light source has been used in
special lighting and display fields. However, mercury can cause
environmental pollution, and an environmental friendly light source
which can replace the super high pressure mercury lamp is highly
desired in the industry.
[0004] FIG. 1 is the structure diagram of a current light source
technology. As shown in FIG. 1, the light source system comprises
an excitation light source 101, an optical lens 102, a color wheel
103 and a driving device 104. The excitation light source 101 is
used to generate an excitation light 106. The optical lens 102
converges the excitation light 106 and relays it to the color wheel
103. The color wheel 103 has different segments with different
phosphors coated on them respectively. When the color wheel 103
rotates around the rotation axis 105 under the driving of the
driving device 104, a color light sequence is generated from
phosphor coatings excited by the excitation light 106 successively.
For example, the phosphor coatings may include red phosphor, green
phosphor and yellow phosphor. So when the red phosphor segment in
the color wheel 103 is in the propagation path of the excitation
light, high brightness red light is generated by the red phosphors
that is under the excitation of the excitation light 106. The
generation process of the green light and yellow light are the same
as the red light.
[0005] However, among all the current phosphor coatings, the
conversion efficiency of the red phosphor is much lower than the
other color phosphor. So there need be an additional light source
to improve the red color light.
[0006] FIG. 2 is the structure diagram of another current light
source technology. As shown in FIG. 2, the light source system
comprises an excitation light source 201, a supplemental light
source 202, a light conversion device 203 generating a red light,
and a dichroic filter 204. The red light 207 generated by the
supplemental light source 202 and the excitation light 205
generated by the excitation light source 201 (e.g. blue color
light) are combined by the dichroic filter 204, and then the red
light 207 is incident to and transmitted by the light conversion
device 203 while the excitation light 205 is used to excite the
light conversion device 203 to generate red converted light 206. So
the red converted light 206 is supplemented by the red light 207.
Unfortunately, the light conversion device 203 has high
reflectivity for red light, which is usually about 50%, so the red
light 207 reflected by the light conversion device 203 will
propagate along the incoming path back to the supplemental light
source 202, which result in a reduction of optical efficiency.
Moreover, for the red converted light 206 generated by the light
conversion device 203, only a part of it can propagate forward, and
the rest will propagate backward toward the dichroic filter 204 and
ultimately reaches the excitation light source 201 or reflected to
the supplemental light source 202. This also causes a low optical
efficiency.
[0007] In conclusion, a light source system and a projection device
are desired that can solve the above technology problems generally
existing in current light source system.
SUMMARY OF THE INVENTION
[0008] The present invention provides a light source system and a
projection device to solve the above problems and improve the
efficiency of the light source.
[0009] To solve the above problems, the present invention provides
a light source system, which includes: an excitation light source,
a wavelength conversion device, a first supplemental light source,
a first light introducing device and a first light collection
device. The excitation light source is used to generate an
excitation light. The wavelength conversion device is used to
convert the excitation light to converted light. The first
supplemental light source is used to generate a first supplemental
light. The spectral range of the first supplemental light overlaps
with the spectral range of the converted light. The first light
introducing device is used to direct the first supplemental light
to the wavelength conversion device which scatters and at least
partially reflects the first supplemental light. The first light
collection device collects the scattered and reflected light of the
first supplemental light. In this system, the sizes of the first
light introducing device and the first light collection device meet
the conditions that: the luminous flux of the first supplemental
light which is scattered and reflected by the wavelength conversion
device and escapes from the first light introducing device is less
than or equal to a quarter of the luminous flux of the first
supplemental light collected by the first light collection
device.
[0010] To solve the above technical problems, the present invention
also provides a projection device including the above light source
system.
[0011] The advantage of this invention is: light introducing device
is used to direct the supplemental light to the wavelength
conversion device, light collection device is used to collect the
supplemental light which is scattered and reflected by the
wavelength conversion device. Through setting the sizes of the
light introducing device and the light collection device, the
luminous flux of the supplemental light which is scattered and
reflected by the wavelength conversion device and escapes from the
light introducing device is less than or equal to a quarter of the
luminous flux of the supplemental light collected by the light
collection device, which can avoid the loss of the supplemental
light caused by the reflection of the wavelength conversion device
and improve the efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 illustrates a conventional light source system.
[0013] FIG. 2 illustrates another conventional light source
system.
[0014] FIG. 3 illustrates the structure of a light source system
according to a first embodiment of the present invention.
[0015] FIG. 4 illustrates the structure of a light source system
according to a second embodiment of the present invention.
[0016] FIG. 5 illustrates the structure of a light source system
according to a third embodiment of the present invention.
[0017] FIG. 6 illustrates the structure of a light source system
according to a fourth embodiment of the present invention.
[0018] FIG. 7 illustrates the structure of a light source system
according to a fifth embodiment of the present invention.
[0019] FIG. 8 illustrates the structure of a light source system
according to a sixth embodiment of the present invention.
[0020] FIG. 9 illustrates the structure of a light source system
according to a seventh embodiment of the present invention.
[0021] FIG. 10 shows a YAG: Ce phosphor's absorption spectrum and
emission spectrum, and the spectra of red, green and blue
lasers.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0022] FIG. 3 is the structure diagram of a light source system
according to a first embodiment of the present invention. As show
in FIG. 3, the light source system in this embodiment mainly
includes an excitation light source 301, a supplemental light
source 302, a light combination device 303, a light collection
device 304, a light reflection device 305, a wavelength conversion
device 306, a reflection substrate 307 and a light homogenization
device 308. The light reflection device 305 includes a curved
reflection surface 3051 (for example, spherical reflection surface
or ellipsoidal reflection surface) with an opening 3052 on it. The
opening 3052 can be a through hole or a transparent zone.
[0023] The excitation light source 301 generates an excitation
light 3011. The supplemental light source 302 generates a
supplemental light 3021. The excitation light 3011 and the
supplemental light 3021 are combined by the light combination
device 303, then the combined light is incident to the light
collection device 304. After collected and relayed by the light
collection device 304, the combined light is incident onto the
wavelength conversion device 306 through the opening 3052. The
wavelength conversion device 306 absorbs the incident excitation
light 3011 and converts it to a converted light 3012 whose
wavelength is different from that of the excitation light 3011. The
converted light 3012 generated by the wavelength conversion device
306 is isotropic, so a part of the converted light 3012 will
propagate in the opposite direction of the excitation light 3011
while other part of the converted light 3012 will propagate in the
forward direction. Meanwhile, a part of the excitation light 3011
which is transmitted through the wavelength conversion device 306
will be reflected by the reflection substrate 307 located on the
side of the wavelength conversion device 306 facing away from the
excitation light source 301. The incident supplemental light is
further scattered by the wavelength conversion device 306. A part
of the scattered supplemental light 3021 is reflected directly by
the wavelength conversion device 306 and propagates towards the
light reflection device 305, while other part of the scattered
supplemental light 3021 passes through the wavelength conversion
device 306 and is reflected by the reflection substrate 307 back to
the wavelength conversion device 306 and passes through it. The
curved reflection surface 3051 collects most of the converted light
3012 and most of the supplemental light 3021 and directs them to
the light homogenization device 308 for homogenization.
[0024] In the first embodiment, the curved reflection surface 3051
may be ellipsoidal, which can reflect the light from one focus
point to another. In this situation, the incident positions on the
wavelength conversion device 306 of the excitation light 3011 and
the supplemental light 3021 are located in the vicinity of one
focus point, while the input port of the light homogenization
device 308 is located in the vicinity of the other focus point. The
curved reflection surface 3051 also may be spherical, which can
reflect light emitted from one point near the spherical center to
another point symmetrical to the first point with respect to the
spherical center. In this situation, the incident positions on the
wavelength conversion device 306 of the excitation light 3011 and
the supplemental light 3021 are located in the vicinity of one of
the two symmetrical points, while the input port of the light
homogenization device 308 is located in the vicinity of the other
point.
[0025] Because the Etendue of the converted light 3012 and the
supplemental light 3021 emitted from the wavelength conversion
device 306 is four times or more of the Etendue of the excitation
light 3011 and the supplemental light 3021 incident through the
opening 3052, in this embodiment, by setting the sizes of the
opening 3052 and the curved reflection surface 3051 appropriately,
the luminous flux of the converted light 3012 and the supplemental
light 3021 escaped from the opening 3052 will be less than or equal
to a quarter of the luminous flux of the converted light 3021 and
the supplemental light 3012 that are collected by the curved
reflection surface 3051. Consequentially, the converted light 3012
and the supplemental light 3021 can be effectively collected, and
excessive light loss due to the opening 3052 can be avoid.
Specifically, in this embodiment, the area of the opening 3052 is
less than or equal to a quarter of the area of the curved
reflection surface 3051.
[0026] In the first embodiment, the excitation light source 301 and
the supplemental light source 302 may be LED or laser diode. The
spectral range of the supplemental light 3021 is different from
that of the excitation light 3011, and at least partially overlaps
with the converted light 3012, so it is a supplement to the
luminance of the converted light 3012. Preferably, the dominant
wavelength of the converted light 3012 is different from that of
the supplemental light 3021 by less than 20 nanometers. Preferably,
the spectral range of the supplemental light 3021 is narrower than
that of the converted light 3012, so it can improve the color
saturation of the mixed light of the supplemental light 3021 and
the converted light 3012. Moreover, the illumination areas of the
excitation light 3011 and the supplemental light 3021 at least
partially overlap on the wavelength conversion device 306 in order
that the supplemental light 3021 and the converted light 3012 can
be mixed adequately.
[0027] It is easy to understand that the spectral range of the
supplemental light and the converted light may not overlap. For
example, the wavelength conversion device may emit green converted
light under excitation while the supplemental light source is red
LED. In this situation, the green converted light and the red
supplemental light can also be collected by the light collection
device 304.
[0028] In this embodiment, the wavelength conversion device 306 may
be a transparent substrate with wavelength conversion materials
doped in the interior, or a reflection substrate 307 with a layer
or wavelength conversion materials coated on the surface. The
wavelength conversion material may be phosphor powder or quantum
dot material that is known in the art. Moreover, in the interior of
the transparent substrate or on the surface of the transparent
substrate or the reflection substrate, scattering particles or
scattering structures may be provided to improve the scattering
effect of the wavelength conversion device 306. The light
combination device 303 may be a dichroic filter or a polarization
beam splitter that is known in the art. The light collection device
304 may be a lens or lens group. The light homogenization device
308 may be an integrating rod which is known in the art. And as
known in the art, the light combination device 303, the light
collection device 304, the reflection substrate 307 and the light
homogenization device 308 are not the essential elements to realize
the purpose of the present invention, so they can be omitted
according to the actual situations. For example, when the
excitation light 3011 and the supplemental light 3021 are incident
into the opening 3052 side by side or from different incident
angles, the light collection device 304 can be omitted.
[0029] Making use of the above-described light source system, the
excitation light 3011 generated by the excitation light source 301
and the supplemental light 3021 generated by the supplemental light
source 302 are directed to the wavelength conversion device 306 by
the opening 3052, and most of the converted light 3012 and the
supplemental light 3021 emitted from the wavelength conversion
device 306 are collected by the curved reflection surface 3051. By
setting the sizes of the opening 3052 and the curved reflection
surface 3051 appropriately, the luminous flux of the converted
light 3012 and the supplemental light 3021 escaped from the opening
3052 can be less than or equal to a quarter of the luminous flux of
the converted light 3012 and the supplemental light 3021 that is
collected by the curved reflection surface 3051, which can avoid
the loss of the converted light 3012 and the supplemental light
3021 and the efficiency of the light source system is improved.
[0030] FIG. 4 is the structure schematic diagram of the light
source according to a second embodiment of the present invention.
As shown in FIG. 4, the light source system in this embodiment
mainly includes a excitation light source 401, a first supplemental
light source 402, a light combination device 403, a light
collection device 404, a light reflection device 405, a wavelength
conversion device 406, a reflection substrate 407, a light
homogenization device 408 and a second supplemental light source
409. In this embodiment, the light reflection device 405 includes a
curved reflection surface 4051. Moreover, it includes a first
opening 4052 and a second opening 4053 located on the curved
reflection surface 4051. The excitation light 4011 and the first
supplemental light 4021 are incident onto the wavelength conversion
device 406 through the first opening 4052 in the same way shown in
FIG. 3. The wavelength conversion device 406 then emits the
converted light and the first supplemental light (not shown) in the
reversed direction. The curved reflection surface 4051 collects
most of these two lights and directs them to the light
homogenization device 408. The differences between the light source
system in this embodiment and that the light source system shown in
FIG. 3 are that: the light source system of this embodiment further
includes the second supplemental light source 409, and there is a
second opening 4053 on the curved reflection surface 4051. The
second supplemental light 4091 generated by the second supplemental
light source 409 is incident onto the wavelength conversion device
406 through the second opening 4053, and scattered by the
wavelength conversion device 406. A part of the scattered second
supplemental light 4091 is reflected by the wavelength conversion
devices 406 and propagates in the reversed direction of the
incident supplemental light 4091, while another part of the
scattered second supplemental light 4091 passes through the
wavelength conversion device 406 and is reflected by the reflection
substrate 407 back to the wavelength conversion device 407 and
passes through it again. Most of the second supplemental light 4091
is collected by the curved reflection surface 4051 and directed
into the light homogenization device 408 to be homogenized with the
converted light and the first supplemental light inside.
[0031] In this embodiment, by setting the size of the second
opening 4053 and the size of curved reflection surface 4051
appropriately, the luminous flux of the second supplemental light
4092 that is scattered and reflected by the wavelength conversion
device 406 and escapes from the second opening 4053 is less than or
equal to a quarter of the luminous flux of the second supplemental
light 4092 that is collected by the curved reflection surface 4051.
Correspondingly, the area of the second opening 4053 is less than
or equal to a quarter of the curved reflection surface's size.
Moreover, the spectral range of the second supplemental light 4091
and the first supplemental light 4021 may be the same, or be
different but both overlap with the spectral range of the converted
light. For example, the converted light is yellow phosphor light,
and the first supplemental light 4021 may be red light from red
laser diode or red LED, while the second supplemental light 4091
may be green light from green laser diode or green LED. FIG. 10
shows the spectrum of a typical YAG: Ce phosphor's emission, as
well as the spectrum of a blue laser (which may be used at the
excitation light), a green laser and a red laser. In another
embodiment, the second supplemental light 4091 generated by the
second supplemental light source 409 passes through the first
opening 4052 to be incident onto the wavelength conversion device
406. In other embodiments, other supplemental light sources and
corresponding openings can be added to the light source system,
which can further improve the luminous flux of the converted light
generated by the wavelength conversion device 406.
[0032] Making use of the above-described light source system, by
using the first supplemental light source 402 and the second
supplemental light source 409 to supplement the luminous flux of
the converted light generated by the wavelength conversion device
406 simultaneously, by using the curved reflection surface 4051 to
efficiently collected the converted light, the first supplemental
light 4021 and the second supplemental light 4091, the output
efficiency of the light source system can be improved.
[0033] FIG. 5 is the structure schematic diagram of the light
source system according to a third embodiment of the present
invention. As show in FIG. 5, the light source system in this
embodiment mainly includes an excitation light source 501, a
supplemental light source 502, a light combination device 503, a
light collection device 504, a light reflection device 505, a
wavelength conversion device 506, and another light collection
device 507. In this embodiment, the light reflection device 505
includes a curved reflection surface 5051 with an opening 5052 on
it. The excitation light 5011 generated by the excitation light
source 501 and the supplemental light 5021 generated by the
supplemental light source 502 are incident onto the wavelength
conversion device 506 through the opening 5052 in the same way
shown in FIG. 3.
[0034] The differences between the light source system of this
embodiment and in the system shown in FIG. 3 are that: in this
embodiment, there is not reflection substrate on the side of the
wavelength conversion device 506 that faces away from the
excitation light source 501 and the supplemental light source 502.
So a part of converted light 5012 generated by the wavelength
conversion device 506 which propagates in forward direction will be
collected by the light collection device 507 (such as lens or
lenses). The converted light 5012 generated by the wavelength
conversion device 506 which propagates in the backward direction is
incident onto the curved reflection surface 5051 and reflected back
to the wavelength conversion device 506 and passes through it again
before being collected by the light collection device 507. In this
embodiment, when the curved reflection surface 5051 is spherical,
the incident position of the excitation light 5011 and the
supplemental light 5021 on the wavelength conversion device 506 is
located in the vicinity of the center of the curved reflection
surface 5051.
[0035] FIG. 6 is the structure schematic diagram of the light
source system according to a fourth embodiment of the present
invention. As show in FIG. 6, the light source system in this
embodiment mainly includes an excitation light source 601, a
supplemental light source 602, a light reflection device 605, a
wavelength conversion device 606, a reflection substrate 607 and a
light homogenization device 608. In this embodiment, the light
reflection device 605 includes a curved reflection surface 6051
with an opening 6052 on it.
[0036] The differences between the light source system of this
embodiment and the system shown in FIG. 3 lie in that: in this
embodiment, the excitation light source 601 and the supplemental
light source 602 are located on different sides of the wavelength
conversion device 606, and the reflection substrate 607 is located
on the side of the wavelength conversion device 606 that is facing
away from the light reflection device 605 and the supplemental
light source 602. The reflection substrate 607 is a dichroic filter
which can transmit the excitation light 6011 generated by the
excitation light source 601, reflect the supplemental light 6021
generated by the supplemental light source 602, and reflect the
converted light 6012 generated by the wavelength conversion device
606. The excitation light 6011 generated by the excitation light
source 601 is incident onto the dichroic filter 607 from the side
facing away from the wavelength conversion device 606, then
transmits through it and is incident to the wavelength conversion
device 606. The converted light 6012 propagates in the forward
direction of the excitation light is incident to the curved
reflection surface 6051 directly, while the converted light 6012
propagates in the backward direction is reflected by the dichroic
filter 607 back to the wavelength conversion device 606 again and
transmits through it before incident onto the curved reflection
surface 6051. Both these two converted light 6012 are reflected by
the curved reflection surface 6051 and collected by the light
homogenization device 608. The supplemental light 6021 generated by
the supplemental light source 602 is incident to the wavelength
conversion device through the opening 6052. The supplemental light
6021 scattered and reflected by the wavelength conversion device
606 and the dichroic filter 607 is incident to the curved
reflection surface 6051 and then collected by the light
homogenization device 608.
[0037] In the other embodiment, the dichroic filter 607 can be
replaced by a reflection substrate with opening on it. In this
situation the excitation light 6011 generated by the excitation
light source 601 is incident to the wavelength conversion device
606 through this opening, while the supplemental light 6021 and the
converted light which propagates towards the excitation light
source 601 are reflected by the reflection substrate.
[0038] The dichroic filter 607 can also be replaced by a spherical
reflection substrate with opening on it, which is separated from
the wavelength conversion device 606, similar to the reflector 605
but located between the excitation light source 601 and the
wavelength conversion device 606. The excitation light 6011
generated by the excitation light source 601 is incident to the
wavelength conversion device 606 through the opening, and the
converted light which propagates towards the excitation light
source will be reflected back to the wavelength conversion device
606 again and transmit it.
[0039] FIG. 7 is the structure schematic diagram of the light
source system according to a fifth embodiment of the present
invention. As show in FIG. 7, the light source system in this
embodiment mainly includes an excitation light source 701, a
supplemental light source 702, a light combination device 703, a
light collection device 704, a light reflection device 705, a
wavelength conversion device 706, and a reflection substrate 707.
The difference between the light source system of this embodiment
and the system shown in FIG. 3 lies in that the light reflection
device 305 in FIG. 3 is replaced by the light reflection device 705
and the light collection device 704. The light reflection device
705 includes a flat reflection surface 7051 with an opening 7052 on
it. In this embodiment, the excitation light 7011 generated by the
excitation light source 701 and the supplemental light 7021
generated by the supplemental light source 702 are incident to the
light collection device 704 through the opening 7052 and then is
relayed to the wavelength conversion device 706 by the light
collection device 704 (such as lens or lenses). Because of the
reflection substrate 707 located on the side of the wavelength
conversion device 706 facing away from the excitation light source
701, the converted light 7012 and the supplemental light 7021 will
propagate in the direction towards the excitation light source 701
and reflected by the flat reflection surface 7051 as the output of
this light source system. In this embodiment, by setting the sizes
of the opening 7052 and the flat reflection surface 7051
appropriately, the luminous flux of the converted light 7012 and
the supplemental light 7021 escaping from the opening 7052 will be
less than or equal to a quarter of the luminous flux of the
converted light and the supplemental light that is collected by the
flat reflection surface 7051. Correspondingly, in this embodiment,
the area of the opening 7052 is less than or equal to a quarter of
the area of the flat reflection surface 7051. In other embodiments,
when the area of the flat reflection surface is large enough that
it can fully collect the converted light 7012 and the supplemental
light 7021, the light collection device 704 can be omitted.
[0040] FIG. 8 is the structure schematic diagram of the light
source system according to a sixth embodiment of the present
invention. As show in FIG. 8, the light source system in this
embodiment mainly includes an excitation light source 801, a
supplemental light source 802, a light combination device 803, a
light reflection device 804, a light collection device 805, a
wavelength conversion device 806, and a reflection substrate
807.
[0041] The difference between the light source system of this
embodiment and the system shown in FIG. 3 is that the light
reflection device 305 is replaced by the light reflection device
804 and the light collection device 805. In this embodiment, after
the excitation light 8011 generated by the excitation light source
801 and the supplemental light 8021 generated by the supplemental
light source 802 are combined by the light combination device 803,
the combined light is reflected by the reflection device 804 and
directed to the light collection device 805 (such as lens or
lenses) to be relayed to the wavelength conversion device 806. The
converted light 8012 and the supplemental light 8021 from the
wavelength conversion device 806 are collected by the light
collection device 805 to output through the area around the light
reflection device 804.
[0042] In this embodiment, by setting the sizes of the light
reflection device 804 and the light collection device 805, the
luminous flux of the converted light 8012 and the supplemental
light 8021 blocked by the light reflection device 804 will be less
than or equal to a quarter of the luminous flux of the converted
light 8012 and the supplemental light 8021 collected by the light
collection device 805. Correspondingly, the projection area of the
reflection device 804 on the light collection device 805 is less
than or equal to a quarter of the area of the light collection
device 805. In other embodiments, the light collection device 805
can also be a reflection surface (such as a flat reflection device
or a curved reflection device) located on a side of the reflection
device 804 which is opposite to the wavelength conversion device
806. In this situation, the projection area of the reflection
device 804 on this collection surface is less than or equal to a
quarter of the area of the collection surface.
[0043] FIG. 9 is the structure schematic diagram of the light
source system according to a seventh embodiment of the present
invention. As show in FIG. 9, the light source system in this
embodiment mainly includes an excitation light source 901, a
supplemental light source 902, a light combination device 903, a
light collection device 904, a light reflection device 905, a
wavelength conversion device 906, a reflection substrate 907 and a
light homogenization device 908. The difference between the light
source system of this embodiment and the system shown in FIG. 3
lies in that the reflective surface of the light reflection device
905 comprises of two nested concentric spherical reflective
surfaces 9051 and 9052 with different diameters. The role of the
light reflection device 905 is the same as the reflection surfaces
305, 405, 505 and 605 in the above embodiments. In other
embodiments, the reflection device 905 may include more than two
nested concentric spherical reflection surfaces or at least two
ellipsoidal reflection surfaces which are nested.
[0044] In the above embodiments, the wavelength conversion device
may be carried on a color wheel described in the background section
(see FIG. 1, color wheel 103) or other conventional element such as
color strip or color drum that can be driven to move laterally or
to rotate.
[0045] This invention further provides a projection device which
includes a light source system described in the above embodiments.
The projection device includes, in addition to the light source
system, a spatial light modulator for forming an image and
projection optics for projecting the light onto a screen.
[0046] In the light source system and the projection device
according to various embodiments of this invention, the
supplemental light is directed to the wavelength conversion device
by the light introducing device, scattered and reflected by the
wavelength conversion device before being collected by the light
collection device. By setting the relative size of the light
introducing device and the light collection device, the luminous
flux of the supplemental light from the wavelength conversion
device that is lost due to the light introducing device is less
than or equal to a quarter of the luminous flux of the supplemental
light collected by the light collection device, which avoid the
loss of the supplemental light due to the reflection by the
wavelength conversion device, so the efficiency of the light source
system can be improved. Moreover, the excitation light is directed
to the wavelength conversion device by the light introducing device
and the converted light that propagates towards the excitation
light source is collected by the light collection device, which can
avoid the loss of the converted light and the efficiency of the
light source system can be further improved.
[0047] It will be apparent to those skilled in the art that various
modification and variations can be made in the light source device
and system of the present invention without departing from the
spirit or scope of the invention. Thus, it is intended that the
present invention cover modifications and variations that come
within the scope of the appended claims and their equivalents.
* * * * *